Odds Conversion Tool

Instantly convert decimal, fractional and American odds and read the implied probability.

Please enter valid odds
Results
Decimal --
Fractional --
American --
Implied Probability --

How to Use This Calculator

  1. Pick an odds format with the toggle: Decimal, Fractional, or American
  2. Type the odds value into the input field
  3. Read the equivalents across all three formats plus implied probability

Examples:

  • Decimal: 2.50
  • Fractional: 3/2
  • American: +150 or -200

Formula

Decimal to Fractional: Fractional = Decimal - 1 (expressed as a fraction)

Decimal to American:

  • If Decimal >= 2.00: American = (Decimal - 1) x 100
  • If Decimal < 2.00: American = -100 / (Decimal - 1)

Implied Probability: 1 / Decimal Odds x 100%

Frequently Asked Questions

What are decimal odds?

Decimal odds show the full return per $1 staked, stake included. Odds of 2.50 return $2.50 for every $1 wagered, which is $1.50 profit.

What are American odds?

American odds run on + and - signs. A positive number (+150) shows the profit on a $100 stake. A negative number (-200) shows the stake needed to profit $100.

What are fractional odds?

Fractional odds such as 3/2 pay $3 profit for every $2 staked. The first figure is the profit; the second is the stake.

What is implied probability?

Implied probability turns odds into a percentage reflecting how likely the bookmaker rates the outcome. The lower the odds, the higher the implied probability.